JWT decoder
Paste a JSON Web Token to read its header, payload and signature — instantly, in your browser. Decode only, nothing is uploaded.
JWT
Header
Payload
Signature
Claims
Everything runs in your browser. No upload, no sign-up.
How it works
STEP 1
Paste your JWT
Drop in a JSON Web Token — the three dot-separated parts header.payload.signature.
STEP 2
Read it
The header and payload are decoded and pretty-printed. Claims like exp, iat and nbf show as readable dates.
STEP 3
Copy
Copy the header or payload with one click. Decode only — nothing leaves your device.